No they are not. We have been discrediting folks who have reported sightings for decades and purposely painted them as crazy meth head hillbillies.
Reports of these objects and their movements have been documented and date back to the 1600s before man had electricity.
If it is indeed militarily devices, its humans from the future who have figured out time travel. That's the only way these military devices could have been seen by people in the 1600s.